Soon after the outbreak of World War I, the area now identified today as Tempelhof Airport was used for training military aerial reconnaissance crews and as an aircraft testing and fabrication center. Following WW I all aviation was discontinued by conditions from the Treaty of Versailles. On September 27, 1930, Rudolf Nebel began a rocket testing and research facility on the site. This was called the Raketenschießplatz Tegel. It was the base of German rocket development until 1937 when development was moved to the secret Peenemünde army research center.
During World War II, Tegel was used as a military training base. Tegel was leveled by Allied air forces in the war.